Upconversion emission enhancement of TiO_2 coated lanthanide-doped Y_2O_3 nanoparticles  

作　　者：吕强 赵连城 国凤云 李美成 

机构地区：[1]Department of Material Physics and Chemistry,School of Material Science and Engineering,Harbin Institute of Technology [2]Center of Electron Microscope Technology,Mudanjiang Medical College

出　　处：《Chinese Physics B》2009年第9期4030-4036,共7页中国物理B（英文版）

摘　　要：To investigate the upconversion emission, this paper synthesizes Tm^3＋ and Yb^3＋ codoped Y2O3 nanoparticles, and then coats them with TiO2 shells for different coating times. The spectral results of TiO2 coated nanoparticles indicate that upconversion emission intensities have respectively been enhanced 3.2, 5.4, and 2.2 times for coating times of 30, 60 and 90 min at an excitation power density of 3.21× 10^2 W. cm^-2, in comparison with the emission intensity of non-coated nanoparticles. Therefore it can be concluded that the intense upconversion emission of Y2O3：Tm^3＋, Yb^3＋ nanoparticles can be achieved by coating the particle surfaces with a shell of specific thickness.To investigate the upconversion emission, this paper synthesizes Tm^3＋ and Yb^3＋ codoped Y2O3 nanoparticles, and then coats them with TiO2 shells for different coating times. The spectral results of TiO2 coated nanoparticles indicate that upconversion emission intensities have respectively been enhanced 3.2, 5.4, and 2.2 times for coating times of 30, 60 and 90 min at an excitation power density of 3.21× 10^2 W. cm^-2, in comparison with the emission intensity of non-coated nanoparticles. Therefore it can be concluded that the intense upconversion emission of Y2O3：Tm^3＋, Yb^3＋ nanoparticles can be achieved by coating the particle surfaces with a shell of specific thickness.

关 键 词：upconversion emission NANOPARTICLE Tm^3＋ and Yb^3＋ codoped Y2O3 TiO2 shell 

分 类 号：TB383.1[一般工业技术—材料科学与工程]